07 Expi one drl

it has the drl enabled. problem is start the truck no drl, put in gear they either both go on and then when you switch from rev to drive the right one goes out, or when going from park to any gear the right one blips on for the briefest of seconds then stays out. it has autolamps and everything else works fine high beams low beams both bulbs work, new bulbs in it too, any help appreciated, am thinking drl module? where is it, or is there a resistor for each lamp i have done some reading into it here and seems there is a plug in box for each side somewhere behind the housings? thanks!!!

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